Emerging technologies for education 4th International Symposium, SETE 2019, held in conjunction with ICWL 2019, Magdeburg, Germany, September 23-25, 2019 : revised selected papers - Popescu, Elvira 1981-; Hao, Tianyong; Hsu, Ting-Chia; Xie, Haoran; Temperini, Marco; Chen, Wei (Information systems and applications, incl. Internet/Web, and HCI, 2020)